nmap

To check machine 192.168.0.22, run nmap remotely from another machine.
# nmap -sT -sU -p 1-1023 192.168.0.22
Starting Nmap 4.11 ( http://www.insecure.org/nmap/ ) at 2008-10-05 15:44 MDT
Interesting ports on (192.168.0.22):
Not shown: 2040 filtered ports
PORT STATE SERVICE
22/tcp open ssh
25/tcp closed smtp
80/tcp closed http
443/tcp closed https
631/tcp closed ipp
631/udp open|filtered unknown

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